Fig. 1

A mediation model of hypothesis. X for predictor (community-based BP monitoring), M1, M2 for mediators (hypertension treatment and lifestyle behaviors) and Y for outcome (hypertension control). M1 and M2 are considered as mediators to the extent to which it carries the influence of a given independent variable (X) to a given dependent variable (Y). a1, a2, b1, b2 for indirect effects, c for direct effect